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A general description is here.
Function ‘compactPDF()’ in package ‘tools’ now takes the default for
argument ‘gs_quality’ from environment variable ‘GS_QUALITY’: there is
a new value ‘"none"’, the ultimate default, which prevents GhostScript
being used in preference to ‘qpdf’ just because environment variable
‘R_GSCMD’ is set.
Function ‘compactPDF()’ in package ‘tools’ now takes the default for argument ‘gs_quality’ from environment variable ‘GS_QUALITY’: there is a new value ‘"none"’, the ultimate default, which prevents GhostScript being used in preference to ‘qpdf’ just because environment variable ‘R_GSCMD’ is set.